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I think your videos show that when there is load on the engine/or rpm is high the fuel trim goes back towards 0%.
When there is little load (like coasting) or rpm is low (idling stationary) fuel trim goes above 10%.
I think that indicates vacuum leak.
Computer is trying to compensate unmetered air (introduced after MAF sensor) by adding more fuel (positive fuel trim percentage).
The PCV can have two different leak. One is the membrane tears, then it allows ambient air to get into crankcase. Blowing into it from that nipple while engine is not running, or even holding your finger when engine is running to see any vacuum is applied to that nipple is ways to diagnose this leak.
The other leak of PCV happens when it is supposed to leak the crankcase from too much intake vacuum. It is a "controlled vacuum" valve. If it doesn't close when there is too much vacuum, as in idle due to throttle plate being closed, then it causes air go through crankshaft seals into the crankcase. This will be apparent if it is difficult to open the engine oil cap due to too much vacuum on idle, or squeling noise from crankshaft seals. And unexplained oil consumption. You don't seem to have these problems.
Again check your valve cover for cracks, crimped rolled over gasket, not well seated gasket around spark plugs.
Good luck!
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